I read this in a different thread a couple days ago and saved it, But forgot to save the username of the poster...

Quote:

You can add a "torque booster" to the procharger and end up with some fat torque. I personally am a fan of turbos, but as far as the 3.7 is concerned the procharger is the way to go.

Basically with a centrifugal supercharger, if you install a 10 psi pulley you get 10 psi somewhere around redline. With the torque booster, youd install a 15 or so psi pulley, and then add a 10 psi wastegate (psi can be adjusted via springs) on the cold side and voila; you now have 10 psi for virtually your whole pull since you're spinning the blower harder.
Seems like the easier and safer route to me. I believe LPFs problem is not a shoddie kit. Justin and I may not see eye to eye, but I have seen his work and even tuned some of his kits before. I don't question his fabrication skills. His ability to tune however, after seeing the fate of a few of his cars now, I do question. But that's enough of that.

Where can I get the stuff required to make the procharger run 10 PSI at all times like the user above said?

Also understand that this piece is designed for a 5.0 pipe route, it may not work with the v6 pipe route or diameter (though i believe both kits are 3"). It may be worth doing some googling and finding a 3" piece of straight pipe with a V-band such as this:Tial Blow Off Valve Adapter- TREADSTONE PERFORMANCE

And just find a corresponding wastegate that will match that V-band. This may give you a little more versatility in placing the WG.

Also, you have a 6 rib blower kit, not an 8-rib, so those pulleys likely wont be the best choice.

I don't have fist hand knowledge about FI systems, is it true procharger built 1 psi of boost every 1000 rpms or so? If so, does it mean it will have 3 psi at 3k, and 7 psi at redline? Assuming it's a stock procharger kit with no upgrades.

Also, let's say you're using a 15psi pulley with 10psi waste gate like volt suggested. At what rpms can you expect to see your full 10 psi boost? Umm 3500-4000 rpm or even before?

The kit I have came with a 3.85 pulley and from what I can find this is a 9.5psi pulley. To run a pulley small enough to hit 15psi you would have to run 8 rib pulley and custom 8 rib crank as the procharger supplied pulleys are 6 rib. I've ran a 3.4 pulley on another car years ago and needed to swap over to a 8 rib set up due to the massive belt slip I was getting with the 6 rib.

Centrifugal superchargers build boost in a nonlinear way. Say you start making boost at 2000rpms then at 3000rpms your at 2 psi some where in the rpm range it will start to increase. Say at 4000rpms instead of 4 psi you might see 4.5 psi and at 5000rpms it might be 6 or 6.5 psi. This is of course just an example and not the boost curve of a procharged 3.7

I'm guessing you can upgrade to a D-1 procharger and a 8 rib setup when you order your kit? Is there any 'significant' advantage of going with a D1 blower instead of P1? I have read quite a bit about these two, but mostly on v8 cars pushing 625+ hp.

I completely understand what you're trying to say about the boost curve. However, I was wondering wouldn't your blower make 10psi of boost at around 5000rpm IF you're using a 15 psi pulley with a waste gate? Assuming you'll be pushing 15 psi at 7000 rpm.

Also, can your ecu/tune make a difference (to a certain degree) to how soon/late you're building boost. Sorry for noob questions, it's still uncharted territory for me.

You would have to find someone who has done that on a 3.7 mustang to get a answer on rpm vs psi with wastegate. I look around a few months ago but had no luck,as for the 8 rib pulley, yes you can get drive pulley for the blower but you will have to source your own crank pulley. Procharger only makes a 6 rib atleast that's what I was told when I called them a few months ago.